Click the Exhibit button. Referring to the exhibit, you have an established RSVP LSP between R1 and R4 when you experience a link failure between R2 and R3. Which two statements are correct? (Choose two.)
A.
R2 sends a ResvTear message upstream to R1 signaling the link failure.
B.
R3 sends a PathTear message downstream to R4 signaling the link failure.
C.
R2 sends a PathTear message upstream to R1 signaling the link failure.
D.
R3 sends a ResvTear message downstream to R4 signaling the link failure.
C. R2 sends a PathTear message upstream to R1 signaling the link failure.
D. R3 sends a ResvTear message downstream to R4 signaling the link failure.
Explanation:
PathTear (Option C):
When the link between R2 and R3 fails, R2 detects the failure and sends a PathTear message upstream to R1. This informs the upstream nodes about the broken path so they can take corrective actions.
ResvTear (Option D):
Similarly, R3 sends a ResvTear message downstream to R4. This notifies the downstream nodes that the reserved resources for the LSP on the failed link are no longer valid, and they should release them.
https://www.juniper.net/documentation/us/en/software/junos/mpls/topics/topic-map/rsvp-overview.html#id-rsvp-message-types__d145436e556
RSVP Overview from Juniper shows RevTear goes back upstream to the sending router.
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